This exercise is heavily inspired by mfumagallis exercise
https://github.com/mfumagalli/Copenhagen/blob/master/Files/day1.md
Exercise1
https://github.com/KHanghoj/bgi_2019/blob/master/exerciseWF.md
Exercise2
https://github.com/KHanghoj/bgi_2019/blob/master/exerciseCoal1.md
Exercise3
https://github.com/KHanghoj/bgi_2019/blob/master/exerciseCoal2.md
Exercise4
This exercise is heavily inspired by mfumagallis exercise
(https://github.com/mfumagalli/Copenhagen/blob/master/Files/day2a.md)
https://github.com/KHanghoj/bgi_2019/blob/master/Files/day2a.md